Finding the Fourth Proportional to 1,213.44, 1,818.72 and 443.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,213.44 : 1,818.72 = 443.52 : x
2. Step 2: Convert to fraction form
   1,213.44/1,818.72 = 443.52/x
3. Step 3: Cross multiply
   1,213.44x = 1,818.72 × 443.52
4. Step 4: Simplify right side
   1,213.44x = 806,638.69
5. Step 5: Solve for x
   x = 806,638.69/1,213.44
6. Step 6: Final answer
   x = 664.75